Received: by 2002:a25:8b91:0:0:0:0:0 with SMTP id j17csp472156ybl; Wed, 4 Dec 2019 05:57:12 -0800 (PST) X-Google-Smtp-Source: APXvYqxeDuGeQQud+PB3RKurFjwogZ/JnEvy3U6bZztBV3ijj9FBB1T5gEc/ehbnvEhoScNc+oDX X-Received: by 2002:a9d:708f:: with SMTP id l15mr2606796otj.286.1575467832616; Wed, 04 Dec 2019 05:57:12 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1575467832; cv=none; d=google.com; s=arc-20160816; b=zlmAc30hVbpmvyeD2HB4mZPg4DrqkrJK5lR4ZGDZnxp3hFpK+NZeHBmkWrIKFLLKd8 QOMhpeZl/yBgBobMZl8rBg10CvXzCAR7KfmkZ1EaAG6R25y8K/4IHSboN2kjxqbHYGDs HkTAOFm93Yduy9DHEd5lWAHBDWv5bdSXI2c/AhggEmP+3ayLfq+MSo6F7DKQ3bM+dEpc Ll97DPwpiuQ+Xe7DmOFf83PoG/6jLLAqfeDwygjeobJdwkrV/V4nJX5KokzOXZ7HlGmu NYJNN70o3nRRjFQwNQzNKqih9XJy4/9U4br9bbcr4vYmq0cWYs0JO5NmNQAe0FE1RVsH V8Rw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date; bh=R5QK39Rnuy3MhBFvKExhMFJAsaetJkvO/p1wI/SFTm4=; b=P1yhVf/e8c9Tbzovy5I/Xq5W/GJ/YDtQNyNv+Rv/9I+TOfKQVbPDGfgsnrXxtjRyO0 7HQo94Gw+QtulII07hcmdeRby0KHYS7HR+4qpj9/ovWeFwwUZFL2egUdffuEwSmlzGP5 o8qlRnB7H4+3licQN8BN0FMB2rqBVUshiheIXOGIGatKjZ2imh3S/iZ0mJcKV2Q9hATZ yrbE0osVrvMk4NOf7q0KmmVUiCu6PNC3+PKRyJ7nyaG51HSXQ1rZgZApQXA/ZbzLapw0 G8vjMHlB6pJBARN0L8m7qtN52aCvCNsOWdhoHgaGB+3G2LhIO2Sm+W21khktHNtyuRss DlPA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id r21si2993421otd.276.2019.12.04.05.57.00; Wed, 04 Dec 2019 05:57:12 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727961AbfLDN4C (ORCPT + 99 others); Wed, 4 Dec 2019 08:56:02 -0500 Received: from foss.arm.com ([217.140.110.172]:56176 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727828AbfLDN4B (ORCPT ); Wed, 4 Dec 2019 08:56:01 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id F3C9A328; Wed, 4 Dec 2019 05:56:00 -0800 (PST) Received: from e107158-lin.cambridge.arm.com (e107158-lin.cambridge.arm.com [10.1.195.21]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id A48CB3F68E; Wed, 4 Dec 2019 05:55:59 -0800 (PST) Date: Wed, 4 Dec 2019 13:55:57 +0000 From: Qais Yousef To: Vincent Guittot Cc: Valentin Schneider , John Stultz , Quentin Perret , Peter Zijlstra , Dietmar Eggemann , Juri Lelli , Patrick Bellasi , Ingo Molnar , lkml Subject: Re: Null pointer crash at find_idlest_group on db845c w/ linus/master Message-ID: <20191204135556.w7xsog6oywrfkaqj@e107158-lin.cambridge.arm.com> References: <20191204094216.u7yld5r3zelp22lf@e107158-lin.cambridge.arm.com> <20191204100925.GA15727@linaro.org> <629cca09-dde7-5d77-42e1-c68f2c1820d2@arm.com> <20191204133224.uiqbkbpseree7xou@e107158-lin.cambridge.arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: User-Agent: NeoMutt/20171215 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/04/19 14:48, Vincent Guittot wrote: > if we want to initialize local_sgs, it should be something like > local_sgs = { > .avg_load = UINT_MAX, > .group_type = group_overloaded, > }; +1 > > to make sure that we will not select local. This doesn't reflect any > kind of reality whereas local=NULL is more meaningful and more robust > IMO It's just defensive programming from my side :) I don't feel strongly about it though. Thanks -- Qais Yousef